diff --git a/lib/plugins/filter/template_locals/i18n.ts b/lib/plugins/filter/template_locals/i18n.ts
index 73367d8df0..daca419db3 100644
--- a/lib/plugins/filter/template_locals/i18n.ts
+++ b/lib/plugins/filter/template_locals/i18n.ts
@@ -13,7 +13,13 @@ function i18nLocalsFilter(locals) {
     const pattern = new Pattern(`${i18nDir}/*path`);
     const data = pattern.match(locals.path);
 
-    if (data && data.lang && i18nLanguages.includes(data.lang)) {
+    if (
+      typeof data !== 'undefined'
+      && !Array.isArray(data)
+      && typeof data !== 'boolean'
+      && data.lang
+      && i18nLanguages.includes(data.lang)
+    ) {
       lang = data.lang;
       page.canonical_path = data.path;
     } else {